\begin{first}%
	body of the environment body of the environment body of the environment
\end{first}
some more text

\begin{second}%
	body of the environment body of the environment body of the environment
\end{second}
% comment!

\begin{third}%
	body of the environment body of the environment body of the environment
\end{third}
% comment!

here is some text
\begin{equation}%
	x^2
\end{equation}
text
